CN104459477A - Direct current system ground fault detection system - Google Patents
Direct current system ground fault detection system Download PDFInfo
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- CN104459477A CN104459477A CN201410855956.XA CN201410855956A CN104459477A CN 104459477 A CN104459477 A CN 104459477A CN 201410855956 A CN201410855956 A CN 201410855956A CN 104459477 A CN104459477 A CN 104459477A
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Abstract
The invention provides a direct current system ground fault detection system. The direct current system ground fault detection system comprises multiple voltage sensors, multiple data processing module, a concentrator, an upper host and an alarm, wherein the multiple voltage sensors are arranged at the tail ends of a bus and branches in a direct current system respectively; the multiple data processing modules are arranged corresponding to the bus and the branches; the input ends of the data processing modules are connected with the output ends of the voltage sensors; the output ends of the data processing modules are connected with the concentrator; the concentrator is connected with the upper host in a wired or wireless mode; the upper host is connected with the alarm. The direct current system ground fault detection system can accurately and timely detect whether the bus or the branches in the direct current system have ground faults or not and can effectively avoid influence of the direct current system and human factors on a detection result.
Description
Technical field
The present invention relates to a kind of detection system, particularly relate to a kind of Design of DC System Grounding Fault Detection system.
Background technology
Straight-flow system is than indispensable equipment in electric system, be widely used in the generating plant such as waterpower, firepower, straight-flow system provides power supply for other DC equipment in electric field, such as: straight-flow system is signalling arrangement, protection, aut.eq., emergency lighting, emergency power pack and isolating switch divides, closing operation provides direct supply, therefore, the job stability of straight-flow system is also just directly connected to the stability of electric power supply, and the stable operation having influence on straight-flow system during the earth fault of straight-flow system most important be also one of modal fault, at present earth fault is carried out detecting mainly being divided into personal monitoring, personal monitoring is by the mode of manual patrol, instrument is adopted directly to measure the ground connection situation of the end (i.e. the bus of straight-flow system or the earth terminal of each branch road) of straight-flow system, this mode workload is huge, waste of manpower, what is more important monitoring result is inaccurate, easy appearance is undetected, badly influence the stability of straight-flow system, along with the development of society, there is balanced bridge method, the power supply disconnecting each branch road by road is needed to determine fault branch, and in the process of divide-shut brake, easily produce fault and maloperation, have a strong impact on the stability of straight-flow system equally, therefore, progressively there is signal injection method again, low frequency signal or two low frequency signal is injected to straight-flow system, although these methods effectively prevent the malfunction that divide-shut brake occurs, but the low frequency signal injected easily is subject to the impact of the ground capacitance of straight-flow system, thus cannot detect the earth fault of straight-flow system exactly.
Therefore, need to propose a kind of new Design of DC System Grounding Fault Detection system, accurately and timely can detect bus in straight-flow system or whether each branch road occurs earth fault, and can effectively avoid straight-flow system self and human factor to impact testing result, guarantee the accuracy of testing result, validity and promptness, thus ensure the reliablely and stablely operation of straight-flow system and electric system.
Summary of the invention
In view of this, the object of this invention is to provide a kind of Design of DC System Grounding Fault Detection system, accurately and timely can detect bus in straight-flow system or whether each branch road occurs earth fault, and can effectively avoid straight-flow system self and human factor to impact testing result, guarantee the accuracy of testing result, validity and promptness, thus ensure the reliablely and stablely operation of straight-flow system and electric system.
A kind of Design of DC System Grounding Fault Detection system provided by the invention, comprises voltage sensor, data processing module, concentrator and upper main frame and alarm;
Described voltage sensor is multiple and the end of the bus be arranged at respectively in straight-flow system and each branch road, and described data processing module is multiple and arranges with the mode of each branch road and the input end of data processing module is connected with the output terminal of voltage sensor to correspond to bus respectively; The output terminal of described data processing module is connected with concentrator, and described concentrator is connected with upper main frame by wired and/or wireless mode, and described upper main frame is connected with alarm;
Described data processing module comprises data acquisition circuit, central processing circuit, comparator circuit and clock circuit, the input end of described data acquisition circuit is connected with voltage sensor output, the output terminal of described data acquisition circuit is connected with comparator circuit, the output terminal of described comparator circuit is connected with central processing circuit, described clock circuit is connected with central processing circuit, and described central processing circuit is also connected with concentrator.
Further, described upper main frame has determined whether earth fault by following functional:
Wherein, when E (ρ) gets minimum value, there is earth fault, U in the branch road or the bus that characterize correspondence
(k)(ρ) be the end voltage-to-ground value of bus or the branch road calculated according to the setup parameter of straight-flow system, V
(k)the measured value of actual voltage-to-ground, K is the number of times of the effective voltage-to-ground value gathered.
Further, described data processing module also comprises the coding circuit be connected with described central processing circuit, and the output terminal of described coding circuit is connected with described concentrator input end.
Further, described system is also provided with GPS synchronous clock circuit and local clock circuit, and described GPS synchronous clock circuit and local synchronous clock circuit are all connected with described upper main frame.
Further, described system also comprises decoding circuit, and the output terminal of described decoding circuit is connected with upper main frame, and the input end of described decoding circuit is connected with described concentrator.
Further, described system is also provided with monitoring comparator circuit, and described monitoring comparator circuit is connected with described upper main frame and carries out data interaction.
Further, described data acquisition circuit comprises the amplifying circuit, filtering circuit and the analog to digital conversion circuit that connect successively, and the input end of described amplifying circuit is connected with described voltage sensor output, and the output terminal of analog to digital conversion circuit is connected with comparator circuit.
Further, described system is also provided with the display screen be connected with described upper main frame.
Further, described concentrator is connected with upper main frame by optical fiber; And/or
Described concentrator is connected with described upper main frame by 4G module.
Beneficial effect of the present invention: Design of DC System Grounding Fault Detection system of the present invention, accurately and timely can detect bus in straight-flow system or whether each branch road occurs earth fault, and can effectively avoid straight-flow system self and human factor to impact testing result, guarantee the accuracy of testing result, validity and promptness, thus ensure the reliablely and stablely operation of straight-flow system and electric system.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described:
Fig. 1 is schematic diagram of the present invention.
Fig. 2 is specific embodiments of the invention schematic diagram.
Embodiment
Fig. 1 is schematic diagram of the present invention, Fig. 2 is specific embodiments of the invention schematic diagram, as shown in the figure, a kind of Design of DC System Grounding Fault Detection system provided by the invention, comprises voltage sensor, data processing module, concentrator and upper main frame and alarm;
Described voltage sensor is multiple and the end of the bus be arranged at respectively in straight-flow system and each branch road, and described data processing module is multiple and arranges with the mode of each branch road and the input end of data processing module is connected with the output terminal of voltage sensor to correspond to bus respectively; The output terminal of described data processing module is connected with concentrator, and described concentrator is connected with upper main frame by wired and/or wireless mode, and described upper main frame is connected with alarm;
Described data processing module comprises data acquisition circuit, central processing circuit, comparator circuit and clock circuit, the input end of described data acquisition circuit is connected with voltage sensor output, the output terminal of described data acquisition circuit is connected with comparator circuit, the output terminal of described comparator circuit is connected with central processing circuit, described clock circuit is connected with central processing circuit, and described central processing circuit is also connected with concentrator, wherein, central processing circuit adopts existing chip or single-chip microcomputer, also or FPGA module, the threshold value of the voltage-to-ground of bus or branch road end is prestored in comparator circuit, when voltage sensor senses to voltage-to-ground value be input to comparator circuit after, magnitude of voltage as actual measurement is greater than threshold value, then this measured data and comparative result are delivered to upper main frame by concentrator by central processing circuit, wherein, clock circuit is that voltage sensor image data is carried out in time, such as gather at certain moment point T0, and be designated as 1 respectively at the voltage-to-ground number of times of the bus do not gathered in the same time or branch road, 2 ... k ... N, certainly, voltage detects within the time cycle of setting, that is, in each time cycle, the number of times of voltage sensor senses is N time, certainly, it is for N time effective degree, and upper main frame is by following functional
calculate the value of E (ρ), when E (ρ) exists minimum value, then prove that this branch road or busbar grounding are broken down, upper main frame is reported to the police by alarm, and is shown by display, wherein U
(k)(ρ) be the end voltage-to-ground value of bus or the branch road calculated according to the setup parameter of straight-flow system, V
(k)the measured value of actual voltage-to-ground, K is the number of times of the effective voltage-to-ground value gathered, therefore, by above-mentioned structure, accurately and timely can detect bus in straight-flow system or whether each branch road occurs earth fault, and can effectively avoid straight-flow system self and human factor to impact testing result, guarantee the accuracy of testing result, validity and promptness, thus ensure the reliablely and stablely operation of straight-flow system and electric system.
In the present embodiment, described data processing module also comprises the coding circuit be connected with described central processing circuit, the output terminal of described coding circuit is connected with described concentrator input end, the data that coding circuit exports for the data processing module corresponding to the bus of certain branch road or system are encoded, and the information that coding circuit exports comprises temporal information corresponding to certain effective voltage value that the processing procedure information of data processing module and voltage sensor export, by the effect of coding module, be beneficial to the information of upper main frame to different branch roads or bus carry out process and determine location of fault information timely and accurately.
In the present embodiment, described system is also provided with GPS synchronous clock circuit and local clock circuit, described GPS synchronous clock circuit and local synchronous clock circuit are all connected with described upper main frame, wherein GPS synchronous clock circuit is used for calibrating local clock circuit, and the clock circuit that the alignment time that local clock circuit produces is sent to data processing module by upper main frame carries out time calibration, thus ensure the synchronism of the voltage acquisition signal of bus and each branch road.
In the present embodiment, described system also comprises decoding circuit, the output terminal of described decoding circuit is connected with upper main frame, the input end of described decoding circuit is connected with described concentrator, the information that described decoding circuit is used for coding circuit exports is decoded and is sent to upper main frame, be convenient to upper main frame process, when data upload, data pass through voltage sensor successively, central processing circuit, coding circuit, concentrator, decoding circuit and upper main frame, and when upper main frame transmitting order to lower levels formula, then sent directly to concentrator by upper main frame, then each central processing circuit is distributed to by concentrator.
In the present embodiment, described system is also provided with monitoring comparator circuit, described monitoring comparator circuit is connected with described upper main frame and carries out data interaction, wherein monitor comparator circuit and obtain decoded information from upper main frame, extract voltage-to-ground information and time information corresponding to voltage that each data processing module exports, the voltage-to-ground of such as certain branch road is V1, the moment that this voltage is corresponding is T1, and monitor comparator circuit and obtain the local clock circuit moment t1 corresponding when clock circuit is T1, and t1 and T1 is compared, if its difference is in the threshold range of setting, then prove that this magnitude of voltage is effective voltage value, and this time gathers as effective times of collection, if difference is outside the threshold range of setting, then this collection result given up by upper main frame, and regard as invalid, because T1 is that clock circuit collects at voltage sensor the time information recorded when voltage signal is input to central processing circuit, although there is certain time-delay, but this time is extreme, therefore, can ignore, and t1 is coded message is transferred to the time information of local clock circuit record after upper main frame, therefore, there is network delay, that is: the time threshold of setting is as this network delay, as time difference is greater than network delay, then prove the time irreversibility of acquisition terminal and upper computer end, affect the accuracy of net result.
In the present embodiment, described data acquisition circuit comprises the amplifying circuit, filtering circuit and the analog to digital conversion circuit that connect successively, the input end of described amplifying circuit is connected with described voltage sensor output, the output terminal of analog to digital conversion circuit is connected with comparator circuit, and data acquisition circuit is that follow-up process does homework.
In the present embodiment, described system is also provided with the display screen be connected with described upper main frame, for showing processing procedure, is convenient to monitoring.
In the present embodiment, described concentrator is connected with upper main frame by optical fiber, by optical fiber, can reduce time delay, improves accuracy; And/or described concentrator is connected with described upper main frame by 4G module, in this way, can reduce connection, cost-saving.
What finally illustrate is, above embodiment is only in order to illustrate technical scheme of the present invention and unrestricted, although with reference to preferred embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that, can modify to technical scheme of the present invention or equivalent replacement, and not departing from aim and the scope of technical solution of the present invention, it all should be encompassed in the middle of right of the present invention.
Claims (9)
1. a Design of DC System Grounding Fault Detection system, is characterized in that: comprise voltage sensor, data processing module, concentrator and upper main frame and alarm;
Described voltage sensor is multiple and the end of the bus be arranged at respectively in straight-flow system and each branch road, and described data processing module is multiple and arranges with the mode of each branch road and the input end of data processing module is connected with the output terminal of voltage sensor to correspond to bus respectively; The output terminal of described data processing module is connected with concentrator, and described concentrator is connected with upper main frame by wired and/or wireless mode, and described upper main frame is connected with alarm;
Described data processing module comprises data acquisition circuit, central processing circuit, comparator circuit and clock circuit, the input end of described data acquisition circuit is connected with voltage sensor output, the output terminal of described data acquisition circuit is connected with comparator circuit, the output terminal of described comparator circuit is connected with central processing circuit, described clock circuit is connected with central processing circuit, and described central processing circuit is also connected with concentrator.
2. DC system earth fault monitoring system according to claim 1, is characterized in that: described upper main frame has determined whether earth fault by following functional:
Wherein, when E (ρ) gets minimum value, there is earth fault, U in the branch road or the bus that characterize correspondence
(k)(ρ) be the end voltage-to-ground value of bus or the branch road calculated according to the setup parameter of straight-flow system, V
(k)the measured value of actual voltage-to-ground, K is the number of times of the effective voltage-to-ground value gathered.
3. Design of DC System Grounding Fault Detection system according to claim 1, it is characterized in that: described data processing module also comprises the coding circuit be connected with described central processing circuit, the output terminal of described coding circuit is connected with described concentrator input end.
4. Design of DC System Grounding Fault Detection system according to claim 3, it is characterized in that: described system is also provided with GPS synchronous clock circuit and local clock circuit, described GPS synchronous clock circuit and local synchronous clock circuit are all connected with described upper main frame.
5. Design of DC System Grounding Fault Detection system according to claim 4, it is characterized in that: described system also comprises decoding circuit, the output terminal of described decoding circuit is connected with upper main frame, and the input end of described decoding circuit is connected with described concentrator.
6. Design of DC System Grounding Fault Detection system according to claim 5, it is characterized in that: described system is also provided with monitoring comparator circuit, described monitoring comparator circuit is connected with described upper main frame and carries out data interaction.
7. Design of DC System Grounding Fault Detection system according to claim 6, it is characterized in that: described data acquisition circuit comprises the amplifying circuit, filtering circuit and the analog to digital conversion circuit that connect successively, the input end of described amplifying circuit is connected with described voltage sensor output, and the output terminal of analog to digital conversion circuit is connected with comparator circuit.
8. Design of DC System Grounding Fault Detection system according to claim 7, is characterized in that: described system is also provided with the display screen be connected with described upper main frame.
9. Design of DC System Grounding Fault Detection system according to claim 8, is characterized in that: described concentrator is connected with upper main frame by optical fiber; And/or
Described concentrator is connected with described upper main frame by 4G module.
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| CN201410855956.XA CN104459477B (en) | 2014-12-31 | 2014-12-31 | Design of DC System Grounding Fault Detection system |
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| CN201410855956.XA CN104459477B (en) | 2014-12-31 | 2014-12-31 | Design of DC System Grounding Fault Detection system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107615086A (en) * | 2015-04-15 | 2018-01-19 | 库珀技术公司 | For system, the method and apparatus of the integrality for diagnosing electric conductor bearing system |
| CN115083035A (en) * | 2021-03-15 | 2022-09-20 | 北汽福田汽车股份有限公司 | Data acquisition method and device, medium, equipment and vehicle |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101359029A (en) * | 2008-09-23 | 2009-02-04 | 东北电力大学 | 1-wire bus DCearth fault on-line automatic monitoring apparatus |
| JP2010237127A (en) * | 2009-03-31 | 2010-10-21 | Nichiyu Giken Kogyo Co Ltd | Apparatus and method for detecting ground-fault |
| CN102129005A (en) * | 2011-01-30 | 2011-07-20 | 重庆元虎科技有限公司 | Transformer substation/power plant secondary circuit direct-current ground indicator and application thereof |
| CN202886514U (en) * | 2012-11-13 | 2013-04-17 | 浙江省星炬科技有限公司 | Direct current (DC) system grounding detector |
| CN203204114U (en) * | 2013-05-08 | 2013-09-18 | 重庆艾派科斯科技有限公司 | Direct current grounding alarm based on current detector with openings |
| CN203720301U (en) * | 2014-01-16 | 2014-07-16 | 国家电网公司 | Fault positioning monitoring system of distribution line |
| CN204287386U (en) * | 2014-12-31 | 2015-04-22 | 国家电网公司 | Design of DC System Grounding Fault Detection system |
-
2014
- 2014-12-31 CN CN201410855956.XA patent/CN104459477B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101359029A (en) * | 2008-09-23 | 2009-02-04 | 东北电力大学 | 1-wire bus DCearth fault on-line automatic monitoring apparatus |
| JP2010237127A (en) * | 2009-03-31 | 2010-10-21 | Nichiyu Giken Kogyo Co Ltd | Apparatus and method for detecting ground-fault |
| CN102129005A (en) * | 2011-01-30 | 2011-07-20 | 重庆元虎科技有限公司 | Transformer substation/power plant secondary circuit direct-current ground indicator and application thereof |
| CN202886514U (en) * | 2012-11-13 | 2013-04-17 | 浙江省星炬科技有限公司 | Direct current (DC) system grounding detector |
| CN203204114U (en) * | 2013-05-08 | 2013-09-18 | 重庆艾派科斯科技有限公司 | Direct current grounding alarm based on current detector with openings |
| CN203720301U (en) * | 2014-01-16 | 2014-07-16 | 国家电网公司 | Fault positioning monitoring system of distribution line |
| CN204287386U (en) * | 2014-12-31 | 2015-04-22 | 国家电网公司 | Design of DC System Grounding Fault Detection system |
Non-Patent Citations (1)
| Title |
|---|
| 钱歇美: "直流系统绝缘微机监测研究", 《昆明大学学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107615086A (en) * | 2015-04-15 | 2018-01-19 | 库珀技术公司 | For system, the method and apparatus of the integrality for diagnosing electric conductor bearing system |
| CN115083035A (en) * | 2021-03-15 | 2022-09-20 | 北汽福田汽车股份有限公司 | Data acquisition method and device, medium, equipment and vehicle |
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Inventor after: Wen Xiaofei Inventor after: Wang Yu Inventor after: Wan Jun Inventor after: Kang Hongfei Inventor after: Hu Xin Inventor before: Wen Xiaofei Inventor before: Wang Yu Inventor before: Wan Jun Inventor before: Kang Hongfei |
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Effective date of registration: 20170808 Address after: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant after: State Grid Corporation of China Applicant after: QINAN POWER SUPPLY BRANCH OF STATE GRID CHONGQING ELECTRIC POWER COMPANY Applicant after: Information Communication Branch State Grid Chongqing Electric Power Co., Ltd. Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant before: State Grid Corporation of China Applicant before: QINAN POWER SUPPLY BRANCH OF STATE GRID CHONGQING ELECTRIC POWER COMPANY |
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